Fully waterproof with minimal weight, the ultralight and uncomplicated BlockerLite Dry Sack boasts an efficient-packing shape to optimally organize and protect essential clothing and gear inside a pack.. . Ultralight: Featherweight 20D silicone- and polyurethane-coated nylon delivers waterproof protection while barely tipping the scales.. Waterproof closure: Roll-top closure features a wrinkle-free stiffening strip to ensure a secure seal when closing the dry sack.. Durable construction: Fully welded seams result in stronger and more durably protective construction compared to sewn-and-taped seams.. Efficient-Packing: PackTight 40818102619 32966900006 10261